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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.57  No.3 (2016)  >  pp.362-367

MATERIALS TRANSACTIONS
<<Previous article Vol.57  No.3 (2016)   pp.362 - 367 Next article>>

Hardness and Wear Properties of Ti-Mo-C-N Film

Toshiaki Toyoda1), Yuji Sutou1), Shoko Komiyama1), Daisuke Ando1), Junichi Koike1), Mei Wang2)
1) Department of Materials Science, Graduate School of Engineering, Tohoku University 2) OSG Corporation

The hardness and wear properties of Ti-Mo-C-N films were investigated by nanoindentation and ball-on-disc measurements, respectively. Ti-Mo-C-N films were deposited onto a stainless steel substrate by a reactive RF magnetron sputtering in the mixture of argon (7.5 ccm) and nitrogen (0–6.0 ccm) gases using Ti25Mo25C50 target. Ti-Mo-C film deposited without nitrogen gas flow showed a hardness of 34.8 GPa. The hardness drastically decreased with increasing nitrogen gas flow rate (fN2) and reached to a minimum hardness of 16.4 GPa at fN2 = 2.0 ccm. Contrarily, at over fN2 = 3.0 ccm, the hardness drastically increased with increasing fN2 and reached a maximal value of 32 GPa, and then slightly decreased again with further increase of fN2. It was found by TEM observation that the drastic decrease in hardness is caused by the formation of nanocrystalline microstructure, while the increase in hardness is due to the microstructural change from nanocrystalline to columnar structure. The friction coefficient decreased with increasing fN2 and the film deposited at fN2 = 5.0 ccm showed a minimum value of 0.27. The simple oxidation test in air indicated that lubricious MoO3 is easy to be formed in the film deposited at a high fN2, which should cause the reduction of friction coefficient.


Keyword:
titanium-molybdenum-carbonitride, hardness, friction coefficient, wear resistance

Received: October 08, 2015
Accepted: December 25, 2015 , Published online: February 25, 2016

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